Ontario Geological Survey
Permanent Link to this Record:
MDI42M08SW00004
| Record Name(s) | Dark River Prospect - 1962 |
|---|---|
| Related Record Type | Partial |
| Record Status | Prospect |
| Date Created | 1987-Jan-07 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Q Unknown |
| Revised By | A Wilson |
Primary Commodities: Iron
Township or Area: East Of Dusey River Area
Latitude: 51° 19' 47.99" Longitude: -86° 21' 20.45"
UTM Zone: 16 Easting: 544890 Northing: 5686720 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42M08SW
Point Location Description: approximate location of drill holes
Location Method: Data Compilation
Access Description:
1961-63 - Mattagami Mining Company Ltd/ Pickands Mather and Co.. - airborne magnetometer survey, ground geophysics, DD-2-1006 ft
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.1238 | 42M08SW0001 | 42M08SW0001 |
| T-2690 | 42M08SW0002 | 42M08SW0002 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Archean
Jul 19, 2006 (Q Unknown) - No outcrop is present in the area of the Dark River iron occurrence. Therefore, geological interpretations in this area are based solely upon diamond drill hole and geophysical information collected by Pickands Mather and Mattagami Mining. The geophysical anomalies were interpreted by Harris (1962) as being indicative of a steeply-dipping folded formation with the fold closure near the eastern end of the property. The diamond drill hole logs indicate that the rocks at this location are dominated by metasedimentary rocks described as quartz-biotite schist, quartz-biotite-sericite schist, impure quartzite and banded quartz-magnetite iron formation. Garnets are frequently reported in drill logs, indicating that the rocks at this location have been metamorphosed to amphibolite grade. Narrow felsic dikes were also reported in the drill logs. The magnetic response of the iron formation suggests the presence of a fold with an east-west trending axial plane. Stratigraphy is interpreted by Harris (1962) to have a near-vertical dip. Drill hole logs for borehole DR-1 document a significant fracture zone at the upper (northern) contact between the quartzite and iron formation. This fracture zone was reported to be serpentinized with some disseminated pyrite. A chloritic fracture zone was also noted within the iron formation sequence in drill hole DR-2. Adjacent to this zone, blocky, broken iron formation containing pyrite and green iron silicate was also reported.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Is |
|---|---|---|---|---|
| Mafic Schist | 2 | Schistose | Adjacent | |
| Schist-Unsubdivided | 3 | Garnet - Amphibolite | Adjacent |
Aug 14, 2014 (A Wilson) - The geophysical anomalies were interpreted by as being indicative of a steeply-dipping folded formation with the fold closure near the eastern end of the property. The diamond drill hole logs indicate that the rocks at this location are dominated by metasedimentary rocks described as quartz-biotite schist, quartz-biotite-sericite schist, impure quartzite and banded quartz-magnetite iron formation. Garnets are frequently reported in drill logs, indicating that the rocks at this location have been metamorphosed to amphibolite grade. Narrow felsic dikes were also reported in the drill logs. The magnetic response of the iron formation suggests the presence of a fold with an east-west trending axial plane.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Magnetite | Economic | Ore |
Aug 14, 2014 (A Wilson) - Drill hole logs for borehole DR-1 document a significant fracture zone at the upper (northern) contact between the quartzite and iron formation. This fracture zone was reported to be serpentinized with some disseminated pyrite. A chloritic fracture zone was also noted within the iron formation sequence in drill hole DR-2. Adjacent to this zone, blocky, broken iron formation containing pyrite and green iron silicate was also reported.
Jul 19, 2006 (Q Unknown) - A maximum thickness of approximately 60 m of quartz-magnetite iron formation was reported in drill hole data from this location (Shlanka, 1968). The presence of disseminated pyrite was also commonly noted in the iron formation.
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Stratiform |
Mono - Iron deposits of Ontario
Publication Number: MDC011 Scale: Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Map - Operation Fort Hope, Makokibatan-Melchett lakes sheet, districts of Kenora (Patricia Portion), Cochrane and Thunder Bay
Publication Number: P0565 Scale: 1:126,720 Date: 1997
Author: Thurston P.C., Carter M.W.
Publisher Name: Ontario Dept. of Mines
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